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There is a copy-paste app that works across devices. I have come across the following sentence that mentions "citation styles" in a way that is incomprehensible to me:

The app lets you copy a text as plain text or, for content copied from
the web, one of several citation styles, such as an HTML or Markdown
link, or the URL or page title.

I am not sure if the term citation styles include all the following four items:

HTML or Markdown link, or the URL or page title.

Thanks for your time.

A bibliographic citation is a reference to a book, article, web page, or other published item. Citations should supply detail to identify the item uniquely.[8] Different citation systems and styles are used in scientific citation, legal citation, prior art, the arts, and the humanities.

Citation styles can be broadly divided into styles common to the Humanities and the Sciences, though there is considerable overlap. Some style guides, such as the Chicago Manual of Style, are quite flexible and cover both parenthetical and note citation systems. Others, such as MLA and APA styles, specify formats within the context of a single citation system. These may be referred to as citation formats as well as citation styles. The various guides thus specify order of appearance,

For example, of publication date, title, and page numbers following the author name, in addition to conventions of punctuation, use of italics, emphasis, parenthesis, quotation marks, etc., particular to their style.emphasized text

"Citation style" here refers to a method of citing the source of a text via a link or descriptive information.

In academia citation styles refer to formal guidelines for documenting sources. Because researchers desire a high degree of fidelity and redundancy, citations often involve lots of information. Here's an example in Chicago from the Purdue OWL:

Henry E. Bent, “Professionalization of the Ph.D. Degree,” College Composition and Communication 58, no. 4 (2007): 141, accessed December 4, 2017, http://www.jstor.org/stable/1978286.

Notice two things. First, in the quoted citation, the URL goes at the very end. The URL is a form of citation in itself, since it effectively gives the source of the information to anyone who clicks on it.

Second, right before the quote, I cited my own source in Markdown style. Your app is using "citation style" to refer to hypertext styles for citing sources. The app presumably generates the code or the text string for the formats mentioned. For example, Markdown could look like this:

[example in Chicago from the Purdue OWL][1]

 [1]: https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/periodicals.html

In a website builder, I could use HTML to do the same thing:

<a href="https://owl.purdue.edu/owl/research_and_citation/chicago_manual_17th_edition/cmos_formatting_and_style_guide/periodicals.html">example in Chicago from the Purdue OWL</a>

All of these are citation styles or formats, with the caveat that someone in a formal research setting should not confuse simple links with sufficient documentation of sources.